/Engine/Source/Runtime/AIModule/Public/GeomUtils.h
value in range [0..1] of the 'Point' project on segment 'Start-End'. Using X and Y components of 3D vectors.
namespace UE { namespace AI { [FVector2D::FReal](API\Runtime\Core\Math\TVector2\FReal) UE::AI::ProjectPointOnSegment2D ( const FVector Point, const FVector Start, const FVector End ) } }